As the subject of the 2002 movie Catch Me If You Can, starring Leo DiCaprio, Frank W. Abagnale was a master at stealing identities — successfully posing as an airline pilot, an attorney and a doctor — all before the age of 21. After cashing millions in fraudulent checks, getting caught and serving jail time, he switched teams and for the past 40 years has been advising the FBI on how to outsmart the bad guys.